Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster: Electronic Structure of Surfaces: Spectroscopy, Surface States
O 51.19: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster B
Probing magnetic interactions between transition metal atoms via YSR states — •Javier Zaldívar1, Deung-Jang Choi1,2,3, Carmen Rubio-Verdú1, Miguel Moreno Ugeda1, Jose Ignacio Pascual1, Edwin Herrera4, Isabel Guillamón4, Hermann Suderow4, Carlos García Fernández3, and Nicolás Lorente2,3 — 1CIC nanoGUNE, San Sebastián, Spain — 2Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), San Sebastián, Spain — 3Donostia International Physics Center, San Sebastián, Spain — 4Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center, UAM, Madrid, Spain
Recent studies proposed the formation of Shiba(YSR) bands in chains of magnetic atoms on superconductors in the presence of spin-orbit coupling as a platform to realize topological superconductivity[1]. However, construction of nanostructures on superconducting materials by atomic manipulation resulted elusive to date, preventing the study of the evolution from single-atom YSR states to Majorana chains.
We compare the YSR excitation spectra of nanostructures built with transition metal adatoms on the surface of β -Bi2Pd [2]. We show these excitations depend on the adsorption state, the mutual interaction, and also track variations due to magnetic fields. Our results provide an insight into the nature of magnetic interactions on a superconductor at the atomic scale at the early stages of chain formation.
[1] S. Nadj-Perge et al., Science 34, 6209 (2014)
[2] D. -J. Choi et al., arxiv: 1709.09224 (2017)